Given that transition capacitance is 5 pico F and diffusion capacitance is 80 pico F, and base emitter dynamic resistance is 1500 Ω, find the β cut-off frequency.(a) 7.8 x 10^6 rad/s(b) 8.0 x 10^6 rad/s(c) 49.2 x 10^6 rad/s(d) 22.7 x 10^6 rad/sI got this question during an online interview.My doubt stems from High Frequency Response in division Transistor Frequency Response of Analog Circuits

Given that transition capacitance is 5 pico F and diffusion capacitanc

1.	Given that transition capacitance is 5 pico F and diffusion capacitance is 80 pico F, and base emitter dynamic resistance is 1500 Ω, find the β cut-off frequency.(a) 7.8 x 10^6 rad/s(b) 8.0 x 10^6 rad/s(c) 49.2 x 10^6 rad/s(d) 22.7 x 10^6 rad/sI got this question during an online interview.My doubt stems from High Frequency Response in division Transistor Frequency Response of Analog Circuits
Answer» Correct choice is (a) 7.8 x 10^6 rad/s For EXPLANATION I would SAY: The FREQUENCY in radians is CALCULATED by ωβ = 1/C.rbe ωβ = 7.8 x 10^6.

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